I know how you feel we have the same problems, however I have found lots of help from the books, Honey for a Childs Heart, and Books Children Love to Read. I am very selective on what my children read as well, and I haven’t been disappointed with the any selection from those books. I can make a few suggestions however you daughter may have read some of these. I am finding boys books harder to find than girls. 🙁
My daughter has read and loved: Boxcar Children, Twig, Miss Hickory, Owl in the Shower(she loves owls and the author Jean Craighead George I think there were 2 cuss words in the book that you could mark through), Grandma’s Attic Series, The Cabin Faced West, Courage of Sarah Noble, Caddie Woodlawn and sequel, Little House, Lamplighter Books(she LOVES these), Billy and Blaze Series, American Girl Series: Kaya, Felicity,Kirsten, Addy, Josefina, Rebecca of Sunnybrook Farm, Betsy-Tacy, One Hundred Dresses,Understood Betsy, Narnia Series, Anne of Green Gables, Frog and Toad, Justin Morgan Had a Horse, Cinnabar,King of the Wind, Burgess Books, James Herriots Treasury for Children.
There are others, she really loves to read as well and this is most of what she has read this summer and fall. I also let her get good easy books to read that are on my list. Yes she can finish them in no time, however its still great lit and might have been a book we missed in read alouds when she was younger. I print out my list of things she can read and we just work down the list. I use those two books for suggestions as well as the book finder here, and other Charlotte Mason friendly curriculums. However my go too more often than not is Books Children Love, and Honey for a Childs Heart. I also let her check out reference books at the library on things she is interested in. For instance she LOVES owls, so she has been checking out lots of reference books on owls to read even some from the adult section. This may not be what others might do, however I like for my children to read, and it doesn’t have to be just fiction. They love to read about things they are interested in and learn as much as they can about that certain thing, mainly animals or things in nature. I hope you find more books for her soon! 🙂